One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,14)(13,16)(17,18,23,26,22,27,21,25)(19,20,28,30,24,32,29,31)(2,5)(3,7)(9,11)(10,13)(12,16)(14,15)(17,19,22,24)(18,20,27,32)(21,29,23,28)(25,31,26,30)(11,16)(13,15)(17,20)(18,24)(19,27)(21,30)(22,32)(23,31)(25,29)(26,28) involution — undirected(2,5)(6,8)(10,14)(13,15)(17,21,22,23)(18,25,27,26)(19,28,24,29)(20,30,32,31)(1,3,4,7)(2,6,5,8)(17,21,22,23)(18,26,27,25)(19,29,24,28)(20,30,32,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.